Emerging Role of Endoscopic Ultrasound in Liver Disease

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1 BRIGHAM AND WOMEN S HOSPITAL HARVARD MEDICAL SCHOOL Emerging Role of Endoscopic Ultrasound in Liver Disease Marvin Ryou, MD Assistant Professor of Medicine Advanced Endoscopy, Gastroenterology

2 Research Programs EUS-Based Hepatobiliary Diagnostics EUS Liver Biopsy EUS Digital Portal Pressure Measurements EUS Elastography EUS-Based Hepatobiliary Therapeutics EUS TIPS EUS Gallbladder

3 Research Programs EUS-Based Hepatobiliary Diagnostics EUS Liver Biopsy EUS Digital Portal Pressure Measurements EUS Elastography EUS-Based Hepatobiliary Therapeutics EUS TIPS EUS Gallbladder

4 EUS Liver Biopsy Background EUS-guided liver biopsy is emerging as a novel method of obtaining benign hepatic tissue New coring needles (fine needle biopsy [FNB]) are available

5 EUS Liver Biopsy

6 EUS Liver Biopsy Background Potential advantages of EUS liver biopsy Technically simple Does not require percutaneous puncture (painful) Image-guided, allows avoidance of blood vessels >1 mm in diameter Simultaneous comprehensive assessment of UGI tract, biliary tree, gallbladder, pancreas Preliminary reports show safety/feasibility but specimen adequacy equivocal (9-91%)

7 EUS Liver Biopsy Aims To compare the histologic yield of 4 different EUS-based needles and 2 percutaneous needles on human cadaveric liver model To identify optimal degree of suction and optimal number of needle excursions for maximal histologic yield

8 EUS Liver Biopsy Methods EUS needles tested 19-G Expect FNA 19-G ProCore 19-G SharkCore 22-G SharkCore

9 Methods EUS Liver Biopsy

10 EUS Liver Biopsy Methods Primary outcome: Number of portal triads Central Vein

11 EUS Liver Biopsy Methods Secondary outcome: Degree of fragmentation Core Fragment Pieces Segment(s) > 15 mm Segment(s) 5-15 mm Segment(s) < 5mm Secondary outcome: Specimen adequacy 5 portal triads and/or segment 15mm (i.e. core)

12 EUS Liver Biopsy Results Schulman AS, Ryou M. GIE 2016

13 EUS Liver Biopsy Results Schulman AS, Ryou M. GIE 2016

14 EUS Liver Biopsy Results Schulman AS, Ryou M. GIE 2016

15 EUS Liver Biopsy Multivariate Regression Analysis Needle Type Fans (#) Effect Estimate p-value ProCore 19-G Expect 19-G SharkCore 19-G 3.23 <0.01* SharkCore 22-G 2.38 <0.01* Location of biopsy Amount of Suction * Right Left cc cc cc Slow-Pull Schulman AS, Ryou M. GIE 2016

16 EUS Liver Biopsy Conclusions SharkCore FNB provides superior histologic yield compared to existing 19-G FNA/FNB needles and 18-G percutaneous needles 22-G SharkCore also performed at least equivalent to 18-G percutaneous needle 3 needle excursions outperform 1 excursion Degree of suction and location in liver did not appear to matter

17 Research Programs EUS-Based Hepatobiliary Diagnostics EUS Liver Biopsy EUS Digital Portal Pressure Measurements EUS Elastography EUS-Based Hepatobiliary Therapeutics EUS TIPS EUS Gallbladder

18 EUS Portal Pressure Background We developed a novel EUS guided approach to obtain direct digital portal pressure measurements Portal vein easily accessed from duodenal bulb 22-G EUS FNA Needle.035 Digital Pressure Wire

19 EUS Portal Pressure Background Portal pressures provides important information re: risks of decompensation and mortality Portal pressures currently estimated using surrogate HVPG, not widely performed

20 EUS Portal Pressure Aims To determine safety and technical feasibility in an animal survival model To determine accuracy compared to transjugular gold standard To compare direct portal vein versus transhepatic first order venule

21 EUS Approach EUS Portal Pressure

22 EUS Portal Pressure EUS Approach A B

23 Transjugular HVPG EUS Portal Pressure

24 EUS Portal Pressure Results All procedure successfully performed in less than 10 minutes Portal pressure measurements performed in less than 4 minutes All animals recovered and survived 2 weeks without incident No bleeding, hematoma or abscesses at necropsy

25 EUS Portal Pressure Results Schulman AS, Ryou M. GIE 2016

26 EUS Portal Pressure Results Equivalent Pressures: Portal vein vs First-Order Venule Pig Number Pressure Measurement (mmhg) at Baseline Pressure Measurement (mmhg) at Day 14 Portal Vein First order venule Portal Vein First order venule Schulman AS, Ryou M. GIE 2016

27 EUS Portal Pressure Results Schulman AS, Ryou M. GIE 2016

28 EUS Portal Pressure Conclusions First report of direct EUS guided portal pressure measurement using digital wire Survival study demonstrated safety and feasibility Technically straightforward and requires minimal time Provides direct portal pressure measurements, unlike HVPG which is surrogate

29 Research Programs EUS-Based Hepatobiliary Diagnostics EUS Liver Biopsy EUS Digital Portal Pressure Measurements EUS Elastography EUS-Based Hepatobiliary Therapeutics EUS TIPS EUS Gallbladder

30 EUS Elastography Background Elastography: measures tissue stiffness and compressibility Fibroscan (transient elastography) has decreased clinical need for liver biopsies Fibroscan has shortcomings: Ascites Thick abdominal wall Does not see most of liver Difficulty distinguishing F2 from F3

31 EUS Elastography Background RTE Images for Metavir Scores F1-F4 Real Time Elastography (RTE): Color mapping reflects underlying differences in tissue compressibility More comprehensive measurements Available on U/S processors Fujimoto 2012

32 EUS Elastography Background Validation of Real-Time Elastography (RTE) Using Transabdominal Probe for Liver Histology EUS Elastography: Elastography from the Inside! ROC analysis differentiating F4 from F0-F3 fibrosis Fujimoto et al., 2013

33 EUS Elastography Works in Progress Standardizing EUS Elasto technique Assessing EUS Elasto s ability to differentiate Normal, Fatty, and Cirrhotic Comparing EUS Elasto with Transabdominal Elasto Correlating EUS Elasto with risk of clinical decompensation Assessing EUS Elasto s ability to differentiate F1, F2, F3, and F4.

34 EUS Elastography Preliminary Results Standardizing EUS Elastography Technique Choose Frames Delineating Perihepatic Fat (Red stripe) Center ROI Avoid bile ducts Avoid vasculature ROI up to 2 cm from transducer YES NO NO Schulman AS, Ryou M. DDW 2016

35 EUS Elastography Preliminary Results Standardizing EUS Elastography Technique Schulman AS, Ryou M. DDW 2016

36 EUS Elastography Preliminary Results EUS Elastography: Differentiating Normal, Fatty, and Cirrhotic Group Number Enrolled Mean LFI [+/- SD] Control [0.6] Fatty liver [0.9] Cirrhosis [0.9] Schulman AS, Ryou M. DDW 2016

37 EUS Elastography Preliminary Results Normal Fatty Cirrhosis Schulman AS, Ryou M. DDW 2016

38 EUS Elastography Conclusions EUS elastography can potentially differentiate Metavir scores (F1, F2, F3, F4) EUS elastography can potentially help in patients for whom transabdominal imaging would be inaccurate (e.g. ascites, thick abdominal wall)

39 Research Programs EUS-Based Hepatobiliary Diagnostics EUS Liver Biopsy EUS Digital Portal Pressure Measurements EUS Elastography EUS-Based Hepatobiliary Therapeutics EUS TIPS EUS Gallbladder

40 EUS TIPS Background Transjugular intrahepatic portosystemic shunt (TIPS) Involves creation of lowresistance channel between portal vein and hepatic vein Deployment of stent allows blood to return to systemic circulation Performed under angiography Associated with inadvertent biliary/arterial damage

41 EUS TIPS Background Hepatic Vein Access Endoscopic Intrahepatic Portosystemic Shunt (EIPS) Transgastric access across hepatic vein and portal vein Measure pressures in both Guidewire advanced through needle which is then removed Balloon dilation of tract Portal Vein Access Tract Dilation

42 EUS TIPS Background Advance stent deployment catheter into portal vein Deploy distal flange Deploy proximal flange Stent Deployment (EUS) LAMS 10 mm length Stent Deployment (Fluoro)

43 EUS TIPS Background Dilate stent to 10 mm Doppler to confirm flow Direct pressure measurements repeated Site of bowel wall entry clipped as needed Stent Dilation Doppler Interrogation of Stent

44 EUS TIPS Aims To determine safety and technical feasibility of EUS guided intrahepatic portosystemic shunt (EIPS) in a survival animal study To compare direct portal and hepatic vein pressure measurements before and after EIPS

45 EUS TIPS Schulman AS, Ryou M, Thompson CC. GIE 2016

46 EUS TIPS Results EIPS successful in 5/5 animals Mean time required for EUS identification, needle access, pressure measurements, and stent placements was 43 min [31-55] No intraprocedural hemodynamic instability Schulman AS, Ryou M, Thompson CC. GIE 2016

47 EUS TIPS Results Comparison of pressure measurements (mm Hg) at baseline and on two week follow-up in each animal Pig Number Pressure Measurement (mmhg) at Baseline Pressure Measurement (mmhg) at Day 14 Hepatic Vein Portal Vein Hepatic Vein Portal Vein Mean Schulman AS, Ryou M, Thompson CC. GIE 2016

48 EUS TIPS Necropsy No intraabdominal or retroperitoneal bleeding In-stent thrombosis found in 3 animals 2 undilated stents 1 dilated stent Small liver abscesses 2 animals Schulman AS, Ryou M, Thompson CC. GIE 2016

49 EUS TIPS Necropsy Schulman AS, Ryou M, Thompson CC. GIE 2016

50 EUS TIPS Conclusions EUS-guided intrahepatic portosystemic shunt using a lumen-apposing metal stent with simultaneous direct portal pressure measurement is technically feasible Procedure can be performed quickly Stent modification required

51 Research Programs EUS-Based Hepatobiliary Diagnostics EUS Liver Biopsy EUS Digital Portal Pressure Measurements EUS Elastography EUS-Based Hepatobiliary Therapeutics EUS TIPS EUS Gallbladder

52 EUS Gallbladder Background EUS-guided lumenapposing stents (LAMS) currently being used for palliative gallbladder drainage EUS-guided GB drainage could have wider applicability with a prosthetic-free device Baron T, NEJM 2015

53 EUS Gallbladder Jejuno-Ileal Anastomosis Creation Clinical Studies Endoscopic delivery of magnets under general anesthesia Twin scope approach Magnets assembled and coupled- marks end of procedure Jejunal Ileal anastomosis created at 5 days All coupled magnets pass 13 Ryou M, Thompson CC. GIE 2015

54 Background EUS Gallbladder

55 EUS Gallbladder Ryou M, Thompson CC. 2012

56 Final Thoughts Endoscopic Ultrasound is a powerful diagnostic and therapeutic tool potentially of assistance in the patient with liver/biliary disease Feasibility of performing EUS-guided liver biopsy, portal pressure measurements, elastography, TIPS, and gallbladder drainage could potentially unify and simplify hepatobiliary care

57 Thank You

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